As part of a road map to foster the implementation of deeper energy retrofits, DOE’s Building America program has set research goals to develop and demonstrate market-ready retrofit solutions to reduce home source energy use by 30–50%. To this end, DOE is funding research to explore what it takes to generate deep energy savings. Topics being researched are 1) the measures needed to achieve large energy savings; 2) the total cost of these measures; 3) the difference between predicted energy savings and actual energy savings; and 4) the beyond-energy benefits of home energy retrofits. The results of this research will help home performance contractors to advance residential retrofits in the United States.